Silmir, Spark of Death

: Whenever a creature would return to the battlefield from your graveyard, you may exile it instead. If you do, put a loyalty counter on Silmir.
+1: Return target creature card from your graveyard to your hand. You lose life equal to that creature's converted mana cost.
-12: Exile the top twenty cards of each player's libary, then return all exiled permanents you own to the battlefield.